Smooth,
dull, dark brown fusion crust completely covers LEW88663. Cleaving this
meteorite revealed an interior that is brown and black with a crystalline
texture. A weathering rind that is about 1-2 mm thick is present. Oxidation is
moderate to heavy in areas. No notable interior features were visible.

Thin Section (,2) Description: Brian Mason

The
section shows a granular aggregate of subequal amounts of olivine and pyroxene
(average grain size 0.3 mm), with about 10% of plagioclase, 5% of troilite, and
a trace of chromite. Brown limonitic staining pervades the section. Microprobe
analyses give the following compositions: olivine, Fa24; pyroxene, Wo2Fs20;
plagioclase, somewhat variable, An17-23. The olivine and pyroxene compositions
match those of an L chondrite, but chondritic structure is absent and the
meteorite has no nickel-iron. The meteorite is tenatively classified as an
achondrite, but the composition does not seem to match that of any known achondrite.